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Finding the Fourth Proportional to 6,987, 9,642.15 and 3,843.30

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Solution

The fourth proportional to 6,987, 9,642.15 and 3,843.30 is: 5,303.80

Step by Step Solution

  1. Step 1: Write the proportion equation
    6,987 : 9,642.15 = 3,843.30 : x
  2. Step 2: Convert to fraction form
    6,987/9,642.15 = 3,843.30/x
  3. Step 3: Cross multiply
    6,987x = 9,642.15 × 3,843.30
  4. Step 4: Simplify right side
    6,987x = 37,057,675.10
  5. Step 5: Solve for x
    x = 37,057,675.10/6,987
  6. Step 6: Final answer
    x = 5,303.80

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1.5x scale

Why These Related Problems?

These problems maintain the same ratio (1.38) or explore similar proportional relationships. Practicing with related ratios helps build understanding of proportional relationships.